This is optional and will send you all messages you would get by using the Slack/Telegram/Sendgrid integration. To add this functionality these steps are needed:
- Create a gmail Account
- Create an app-password
- Fill in the config.properties
Open this https://accounts.google.com/signup and create an account.
Open this https://myaccount.google.com/apppasswords and create an app-password.
Copy the app-password now as you will not be able to access it later, you can always create a new one though.
Fill in all gmail fields in the config.properties and you're done